Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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An E-capless AC-DC CRM Flyback LED Driver with Variable On-time Control

  • Yao, Kai (School of Automation, Nanjing University of Science and Technology) ;
  • Bi, Xiaopeng (School of Automation, Nanjing University of Science and Technology) ;
  • Yang, Siwen (School of Automation, Nanjing University of Science and Technology)
  • Received : 2016.05.25
  • Accepted : 2016.11.25
  • Published : 2017.03.20
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Abstract

LED is a promising new generation of green lighting with the advantages of high efficiency, good optical performance, long lifetime and environmental friendliness. A pulsating current can be used to drive LEDs. However, current with a high peak-to-average ratio is unfavorable for LEDs. A novel control scheme for the ac-dc critical conduction mode (CRM) flyback LED driver is proposed in this paper. By using the input voltage, output voltage and average output current to control the turn-on time of the switch, the peak-to-average ratio of the output current can be reduced. The operation principle is analyzed and an implementation circuit is put forward. Experimental results show the effectiveness of the proposed scheme.

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References

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